When you have anal sex with a partner, and then you ejaculate in their poopchute. Then, when they poop, it is what they call a frosted turd.
I gave my girl a nice pounding in the ass, and then a little bit later, she wanted me to check out her frosted turd.
The sperm-covered feces expelled from the anus immediatley following butt sex.
Sweet dude, I just took a frosted turd.